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A very nice test, simple and to the point with useful data.
Well done!

The early 45 Colt Army load was 40 grains FFF by weight. A very hard hitting load. Early 1873 cases were able to hold more powder than modern.
Crack open BP Goverment 45-70 loads and you will find 70 grains of BP in them too. Powder density changes but weight is a constant.

I would have to agree with the powder granulation. I betcha that GOEX Old E in 3Fg granulation would put the rifle and revolver closer together. The 3Fg is very consistant in the 45 Colt. Especially in revolvers.

I agree with the above. Wanna have a nice surprise ... load that 40 grains in a case ... compress till you can seat your 230 or 255 grain boolit. This IS energetic. Very fun to shoot in revolver or rifle ... oh yea ... that 40 grains should be Swiss or Old E 3Fg powder. You gotta try this to appreciate the why of the US Army demanding a lesser load for the troops

Last edited by bigted; 05-19-2019 at 10:23 PM.
Reason: Foolish omitance of info

Was that a full case of black powder?
I have to ask because BP is measured volume not weight.
A BP powder measure says grains, but it is not weighed grains, it a grains of volume.

The above statement is complete nonsense. How do you think the volume measure got calibrated? Yes once a volume was calibrated to a known weight, the volume measure could be relied upon to dispense powder very close to the value it was calibrated against. Till the powder changed or the hands that did the dipping.
There is no such thing as grains of volume.

All I know is that in loading 30, 35 and 40 grains of 3f black powder is three different velocities and power. Compression is different but take my word here ... load 30 grains in a few and load 40 grains in others and the difference will be readily apparent upon the gentle yank of the trigger.

And the volume thing ... never was a "VOLUME" thing till the Pyro-crud came into being. It being very lite in comparison to real black powder ... THEY [ the makers of Pyrodex ] instructed folks that wanted to use their product ... to use volume to volume instead of grain for grain as a grain of Pyro is much more powder and power then an equal grain weight of real black powder.

Since then, the controversy of volume versus weight has been an issue with some folks.

Greenjoytj says: "The above statement is complete nonsense. How do you think the volume measure got calibrated? Yes once a volume was calibrated to a known weight, the volume measure could be relied upon to dispense powder very close to the value it was calibrated against. Till the powder changed or the hands that did the dipping.
There is no such thing as grains of volume.